Phosphor wheel, light source module and projector

Abstract

The present application relates to the field of projection technology and discloses a phosphor wheel, a light source module, and a projector. A phosphor wheel includes a base, a first phosphor layer, and a second phosphor layer. The base includes an excitation light reflecting section and an excitation light transmitting section. The first phosphor layer is disposed on a surface of the excitation light reflecting section facing a direction of incident light and spreading along a circumferential direction of the base. The second phosphor layer is disposed on a surface of the excitation light transmitting section facing away from the direction of incident light and spreading along a circumferential direction of the base. The first phosphor layer and the second phosphor layer are offset to each other in a radial direction of the base.

What is claimed is: 
     
       1. A phosphor wheel, comprising:
 a base comprising an excitation light reflecting section and an excitation light transmitting section; 
 a first phosphor layer disposed on a surface of the excitation light reflecting section facing a direction of incident light and spreading along a circumferential direction of the base; and 
 a second phosphor layer disposed on a surface of the excitation light transmitting section facing away from the direction of incident light and spreading along the circumferential direction of the base; 
 wherein the first phosphor layer and the second phosphor layer are offset to each other in a radial direction of the base, 
 the base comprises a reflecting layer and a transmitting layer, wherein,
 the reflecting layer and the transmitting layer are stacked, a portion of the transmitting layer covered by the reflecting layer is the excitation light reflecting section or the reflecting layer is the excitation light reflecting section, and a portion of the transmitting layer not covered by the reflecting layer is the excitation light transmitting section; or 
 the transmitting layer is ring-shaped, the transmitting layer is sleeved on an outer periphery of the reflecting layer, the reflecting layer is the excitation light reflecting section, and the transmitting layer is the excitation light transmitting section, 
 
 a filter layer is disposed on the transmitting layer, the filter layer is configured to transmit excitation light and reflect phosphor light excited from the second phosphor layer, 
 a projection area of the second phosphor layer in an axial direction of the phosphor wheel is contained in the filter layer. 
 
     
     
       2. The phosphor wheel according to  claim 1 , wherein the transmitting layer extends beyond an edge of the reflecting layer, and the second phosphor layer is disposed on a portion of the transmitting layer extending beyond the reflecting layer. 
     
     
       3. The phosphor wheel according to  claim 1 , wherein the filter layer is a coating filter disposed on the transmitting layer. 
     
     
       4. The phosphor wheel according to  claim 1 , wherein a spread path of the first phosphor layer and a spread path of the second phosphor layer are both ring-shaped, the first phosphor layer and the second phosphor layer are coaxially disposed, and an outer diameter of the first phosphor layer is equal to an inner diameter of the second phosphor layer. 
     
     
       5. A light source module comprising a first light source, a light combining system, and a phosphor wheel;
 wherein the phosphor wheel comprises a base, a first phosphor layer, and a second phosphor layer, the base comprises an excitation light reflecting section and an excitation light transmitting section, the first phosphor layer is disposed on a surface of the excitation light reflecting section facing a direction of incident light and spreads along a circumferential direction of the base, the second phosphor layer is disposed on a surface of the excitation light transmitting section facing away from the direction of incident light and spreads along the circumferential direction of the base, and the first phosphor layer and the second phosphor layer are offset to each other in a radial direction of the base; 
 a part of excitation light emitted by the first light source irradiates the first phosphor layer and excites first excited phosphor light, and a part of the excitation light emitted by the first light source passes through the excitation light transmitting section, irradiates the second phosphor layer and excites second excited phosphor light; and 
 the light combining system is configured to combine the first excited phosphor light and the second excited phosphor light, 
 wherein the base comprises a reflecting layer and a transmitting layer, wherein,
 the reflecting layer and the transmitting layer are stacked, a portion of the transmitting layer covered by the reflecting layer is the excitation light reflecting section or the reflecting layer is the excitation light reflecting section, and a portion of the transmitting layer not covered by the reflecting layer is the excitation light transmitting section; or 
 the transmitting layer is ring-shaped, the transmitting layer is sleeved on an outer periphery of the reflecting layer, the reflecting layer is the excitation light reflecting section, and the transmitting layer is the excitation light transmitting section, 
 
 a filter layer is disposed on the transmitting layer, the filter layer is configured to transmit excitation light and reflect phosphor light excited from the second phosphor layer, 
 a projection area of the second phosphor layer in an axial direction of the phosphor wheel is contained in the filter layer. 
 
     
     
       6. A projector comprising the light source module according to  claim 5 .